Christoph Lofi

General

Dr. Christoph Lofi



Technische Universität Braunschweig
Institut für Informationssysteme
Mühlenpfordtstraße 23, 2.OG 
D-38106 Braunschweig

 
 

Phone: +49 (531) 391 7443
Email: lofi@ifis.cs.tu-bs.de
Room: 233

Detail

I worked at IFIS from 2008 to 2016. Currently, I am an Assistant Professor at Web Information Systems Group at TU Delft.
My research focus is on exploring novel human-centered query paradigms (like analogy queries), incorporating crowd-sourcing into information systems research, applications of novel query paradigms in e-commerce and e-business, and database query personalization (e.g. Skyline queries).

Have a look at our new poster gallery to give you an idea:

Short CV

starting April 2016: Assistant Professor Delft University of Technology
2014-2016: PostDoc at Technische Universität Braunschweig
2012-2014: PostDoc at National Institute of Informatics, Tokyo, Japan
2011-2012: PostDoc at Technische Universität Braunschweig
2011: Defense of Doctoral Thesis at Technische Universität Braunschweig
2008-2011: Ph.D. Researcher at Technische Universit Braunschweig
2006-2008: Ph.D. Researcher Researcher at L3S Research Center, Leibniz University Hannover
2005: Diploma Thesis at Collaborative Software Development Laboratory, University of Hawai’i, Honolulu - Manoa, Certificate issued by University Kaiserslautern
2002-2004: Assistant Researcher at Fraunhofer Institute for Experimental Software Engineering, Kaiserslautern 
2000-2004: Student at University Kaiserslautern

Teaching

I was the lecturer for the following lectures:

From 2010 to 2014, I was also a member of the steering commitee of the ITIS graduate school.

Projects

 

(2012-2015) in MovieExplore - Discovering Movies in a Human-Centric Fashion

project management

This project focuses on discovering the perceptual properties of movies (and also other experience items) for enabeling human-centric interaction paradigms. This will allow users to interact with complex product spaces in a more natural and easier to understand fashion. 

see http://www.ifis.cs.tu-bs.de/project/movieexplore

 

(2015) SQL-Alchemist 

project management

SQL Alchemist Logo

This project is funded by the presidential office of TU Braunschweig in order to foster and encourage innovation in university didactics. In this project, we develop novel concepts for teaching relational query languages like SQL, unifying approaches from modern didactics with mobile gamification. The goal of this project is to develop and establish a “serious” online game for supporting the B.Sc. lecture “Relational Databases 1”

see http://www.ifis.cs.tu-bs.de/content/sqlalchemist (in German)

 

(2013-2015) Anaqonda Project - Analogy Queries by Ontology-based Data Analytics

project management

ANAQONDA LOGO

The Anaqonda project deals with intelligent queries und personalization, and focuses especially on analogy queries. This project was funded by DAAD and executed at NII Tokyo.

For more information, see www.ifis.cs.tu-bs.de/content/anaqonda

 

(2006-2010) APIS - Advanced Personalization in Information Services

project member

APIS Logo

The APIS project (Advanced Personalization in Information Services) investigates the impact of personalization technology on future information provisioning. Being interdisciplinary between computer science and cognitive sciences a basic belief of the APIS group is that modern information provisioning needs advanced query processing and optimization techniques using and understanding human preferences, usage patterns, conceptual views and (domain) ontologies. At the same time the architectures for information provisioning have to move from monolithical database systems to more open service-oriented infrastructures.
Source Code for our Skyline Simulator & Datasets can be found here.
For more information, see http://www.ifis.cs.tu-bs.de/content/apis​

 

(2006 - 2008)  Prolix - Process Oriented Learning and Information Exchange

project member


see ftp.cordis.europa.eu/pub/ist/docs/telearn/prolix.pdf

 

(2005) Hackystat

project member
see https://code.google.com/p/hackystat/

 

Publications
2016
Lofi, C., A. Ahamed, P. Kulkarni, and R. Thakkar, "Benchmarking Semantic Capabilities of Analogy Querying Algorithms", 21th International Conference on Database Systems for Advanced Applications (DASFAA), Dallas, TX, Usa, 04/2016. Abstract
Lofi, C., "Measuring Semantic Similarity and Relatedness with Distributional and Knowledge-based Approaches", Database Society of Japan (DBSJ) Journal, vol. 14, no. 1, pp. 1-9, 03/2016. Abstract  Download: DBSJ01.pdf (574.61 KB)
2015
Wille, P., C. Lofi, and W. - T. Balke, "Towards Narrative Information Systems", 16th International Conference on Web-Age Information Management (WAIM), Qingdao, Shandong, China, 06/2015. Abstract  Download: Wille-Towards-Narrative-Information-Systems.pdf (424.2 KB)
Maarry, K. E., C. Lofi, and W. - T. Balke, "Crowdsourcing for Query Processing on Web Data: A Case Study on the Skyline Operator", Journal of Computing and Information Technology (CIT), vol. 23, no. 1, 03/2015. Abstract  Download: CIT_23(1)_camera-ready.pdf (571.16 KB)
Lofi, C., and P. Wille, "Exploiting Social Judgements in Big Data Analytics", In Proc. of 16th LWA Conference, Trier, Germany, 2015. Abstract  Download: 15_LWA_76.pdf (718.05 KB)
2014
Lofi, C., and C. Nieke, "Exploiting Perceptual Similarity: Privacy-Preserving Cooperative Query Personalization", 15th International Conference on Web Information System Engineering (WISE), Thessaloniki, Greece, 10/2014. Abstract  Download: WISE 2014 Full Text (833.33 KB)
Lofi, C., and K. E. Maarry, "Design Patterns for Hybrid Algorithmic-Crowdsourcing Workflows", 16th IEEE Conf. on Business Informatics (CBI), Geneva, Switzerland, 07/2014. Abstract  Download: CBI2014 Fulltext (753.19 KB)
Lofi, C., C. Nieke, and N. Collier, "Discriminating Rhetorical Analogies in Social Media", 14th Conference of the European Chapter of the Association for Computational Linguistics (EACL), Gothenburg, Sweden, 04/2014. Abstract  Download: 14EACL_05_final.pdf (761.24 KB); crowd_sourcing_results_full.csv (2.09 MB); goldset_snippets.csv (1.92 MB)
He, J., K. Kunze, C. Lofi, S. Madria, and S. Sigg, "Towards Mobile Sensor-Aware Crowdsourcing: Architecture, Opportunities and Challenges", Workshop on Uncertain and Crowdsourced Data (UnCrowd), Bali, Indonesia, 2014. Abstract  Download: hybridcrowd.pdf (1.14 MB)
2013
Lofi, C., K. E. Maarry, and W. - T. Balke, "Skyline Queries over Incomplete Data - Error Models for Focused Crowd-Sourcing", 32th Int. Conf. on Conceptual Modeling (ER), Hong Kong, China, 11/2013. Abstract  Download: paper_118.pdf (977.04 KB)
Lofi, C., and C. Nieke, "Modeling Analogies for Human-Centered Information Systems", 5th Int. Conf. On Social Informatics (SocInfo), Kyoto, Japan, 11/13, 2013. Abstract  Download: 13SocInfo_03.pdf (683.65 KB)
Lofi, C., "Analogy Queries in Information Systems – A New Challenge", Journal of Information & Knowledge Management (JIKM), vol. 12, no. 3, 09/2013.  Download: 13JIKM.pdf (729.8 KB)
Lofi, C., K. E. Maarry, and W. - T. Balke, "Skyline Queries in Crowd-Enabled Databases", Int. Conf. on Extending Database Technology (EDBT), Genoa, Italy, 03/2013. Abstract  Download: 13_edbt_final2.pdf (1.31 MB)
Lofi, C., "Just ask a human? – Controlling Quality in Relational Similarity and Analogy Processing using the Crowd", Crowd-enabled Data and Information Management (CDIM) Workshop at Database Systems for Business Technology and Web (BTW), Magdeburg, Germany, 2013. Abstract  Download: 13CDIM_Final.pdf (611.43 KB); Data (72.13 KB)
2012
Lofi, C., U. Güntzer, and W. - T. Balke, "Equivalence Heuristics for Malleability-Aware Skylines", Journal of Computing Science and Engineering (JCSE), vol. 6, no. 3, 09/2012. Abstract  Download: JCSE-2012-0037.pdf (1.97 MB)
Selke, J., C. Lofi, and W. - T. Balke, "Pushing the Boundaries of Crowd-Enabled Databases with Query-Driven Schema Expansion", 38th Int. Conf. on Very Large Data Bases (VLDB), Istanbul, Turkey, in PVLDB 5(6) , 08/12, 2012. Abstract  Download: 267_camera-ready-v3.pdf (1.25 MB)
Lofi, C., and R. Krestel, "iParticipate: Automatic Tweet Generation from Local Government Data", 17th International Conference on Database Systems for Advanced Applications (DASFAA) - Demo Track, Busan, South Korea, 04/2012. Abstract  Download: dasfaa12_iparticipate (211.5 KB)
Lofi, C., U. Güntzer, and W. - T. Balke, "Malleability-Aware Skyline Computation on Linked Open Data", 17th International Conference on Database Systems for Advanced Applications (DASFAA), Busan, South Korea, 04/2012. Abstract  Download: Dasfaa12_Lofi (799.68 KB)
Lofi, C., and W. - T. Balke, "On Skyline Queries and how to Choose from Pareto Sets", Advanced Query Processing: Issues and Trends, vol. 1: Springer, pp. 15–36., 2012. Abstract  Download: printversion.pdf (415.01 KB)
2011
Lofi, C., U. Güntzer, and W. - T. Balke, "Eliciting Skyline Trade-Offs using Example-Based Heuristics for E-Commerce Applications", IEEE Conference on Commerce and Enterprise Computing (CEC), Luxembourg, Luxembourg, 09/2011. Abstract  Download: Full Text CEC 2011 (689.39 KB)
Lofi, C., "Choosing the Right Thing: Cooperative Trade-Off Enhanced Skyline Queries", PhD Workshop at the International Conference On Data Engineering (ICDE), Hannover, Germany, 04/2011. Abstract  Download: 11ICDE_02.pdf (366.51 KB)
Lofi, C., Cooperative Trade-Off Enhanced Skyline Queries, : Carl-Friedrich-Gauß-Faculty, TU Braunschweig, 2011. Abstract  Download: Dr_Lofi.pdf (735.21 KB)
Homoceanu, S., M. Loster, C. Lofi, and W. - T. Balke, "Will I like it? – Providing Product Overviews based on Opinion Excerpts", IEEE Conference on Commerce and Enterprise Computing (CEC), Luxembourg, Luxembourg, 2011. Abstract  Download: Full Text CEC 2011 (587.95 KB)
2010
Lofi, C., C. Nieke, and W. - T. Balke, "Mobile Product Browsing using Bayesian Retrieval", 12th IEEE Conference on Commerce and Enterprise Computing (CEC), Shanghai, China, 11/2010. Abstract  Download: Fulltext (726.29 KB)
Lofi, C., and W. - T. Balke, "Preference Trade-Offs – Towards manageable Skylines", 22. GI-Workshop Grundlagen von Datenbanken (GvD), Bad Helmstedt, Germany, 05/2010. Abstract  Download: fulltext.pdf (642.42 KB)
Selke, J., C. Lofi, and W. - T. Balke, "Highly Scalable Multiprocessing Algorithms for Preference-Based Database Retrieval", 15th International Conference on Database Systems for Advanced Applications (DASFAA), Tsukuba, Japan, 04/2010. Abstract  Download: Fulltext.pdf (1.01 MB)
Lofi, C., U. Güntzer, and W. - T. Balke, "Efficient Computation of Trade-Off Skylines", 13th International Conference on Extending Database Technology (EDBT), Lausanne, Switzerland, 03/2010. Abstract  Download: Fulltext.pdf (1.08 MB)
2009
Lofi, C., W. - T. Balke, and U. Güntzer, "Efficient Skyline Refinement using Trade-Offs Respecting Don't Care Attributes", International Journal of Computer Science & Applications (IJCSA), vol. 6, no. 5, 10/2009. Abstract  Download: Fulltext PDF (831.91 KB)
Lofi, C., W. - T. Balke, and U. Güntzer, "Efficient Skyline Refinement using Trade-Offs", 3rd IEEE International Conference on Research Challenges in Information Science (RCIS), Fès, Morocco, 04/2009. Abstract  Download: rcis09_final.pdf (540.78 KB)
2008
Lofi, C., U. Güntzer, and W. - T. Balke, "Consistency Check Algorithms for Multi-Dimensional Preference Trade-Offs", International Journal of Computer Science & Applications (IJCSA), vol. 5, no. 3b, pp. 165 - 185, 2008. Abstract  Download: Fulltext-PDF (888.54 KB)
Lofi, C., W. - T. Balke, and U. Güntzer, "Efficiently Performing Consistency Checks for Multi-Dimensional Preference Trade-Offs", 2nd IEEE International Conference on Research Challenges in Information Science (RCIS), Marrakech, Morocco, 2008. Abstract  Download: Fulltext-PDF (555.38 KB)